Weight By Gini Index. How are these calculated?

tommy1234

I'm curious about how the numbers in Weight By Gini Index operator is calculated. Can someone explain the math?
The example set that is going to be processed comes from the Process Documents from Data operator with TF-IDF vector creation.

MartinLiebig

Hi @tommy1234,

do you mean our specific implementation or Gini Index in general?

~martin

tommy1234

Hi @mschmitz
It's the specific implementation in RapidMiner.

- tommy

MartinLiebig

https://github.com/rapidminer/rapidminer-studio/blob/master/src/main/java/com/rapidminer/operator/learner/tree/criterions/GiniIndexCriterion.java

is the implementation behind it